扇形是与圆形有关的一种重要图形，其面积与圆心角（顶角）、圆半径相关，圆心角为n°，半径为r的扇形面积为nºπr²/360º。如果其顶角采用弧度单位，则可简化为半径乘弧长乘1/2，弧长=半径×弧度）
使PPI呈现器上的年夜片扇形面积洗白。
This would show on the PPI scope as a large pie-slice of wash-out.
小镇面积47平方公里，呈扇形铺开，在湖山之间犹如一颗珍珠熠熠生辉。
Covering an area of 47 square kilometers, the little fan-shaped town glimmers like a bright pearl in the landscape of lakes and mountains.
与扇形法计算的效率相比，等周长法的结果偏高，等面积法的结果偏低。
As compared to the sector method, the equal-area method yields a higher fin efficiency while the equal-perimeter method gives a lower fin efficiency.
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